Math Revision Geometry Exam July Flashcards
Greater than 0 but smaller than 90 degrees
Acute angle
Equal to 90 degrees
Right angle
Greater than 90 smaller than 180 degrees
Obtuse angle
Straight angle
Equal to 180 degrees
Greater than 180 but smaller than 360degrees
Reflex angle
Equal to 360 degrees - full circle
Revolution
Secants
Two lines intersecting
Bisector
One line intersects another exactly in the middle
Parallel lines
Two or more lines which are always the same distance apart and never cross each other
A line that makes a 90 degree angle with another line
Perpendicular
Know what these are
Adjacent angles Complementary angles Angles on a straight line Vertically opposite angles Angles around a point
Adjacent angles
Complementary angles - angles with sum of 90
Angles on a straight line - sum of angles on a straight line = 180
Vertically opposite angles - opposite angles are equal
Angles around a point - the sun or the angles around a point in 360
Properties of a square
- All sides are equal in length
- Opposite sides are parallel
- All angles are 90 degrees
- The diagonals bisect perpendicularly and bisect the angles the diagonals are equal length
Properties of rectangle
- Opposite sides are parallel and equal in length
- All angles are 90 degrees
- Diagonals bisect each other
- Diagonals are equal in length
Parallelogram properties
- Opposite sides are parallel and equal in length
- Opposite angles equal
- Diagonals bisect each other
Properties of rhombus
- All sides are equal in length
- The opposite sides are parallel
- Opposite angles are equal
- Diagonals bisect perpendicular and bisect the angles